Method of exact placing of printing plates, made of rubber or similar material, on printing cylinders or flat printing plate supports



p 9, 1952 E. KREGLEWSKI 2,609,749

METHOD OF EXACT PLACING OF PRINTING PLATES, MADE OF RUBBER 0R SIMILAR MATERIAL, 0N PRINTING CYLINDERS 0R FLAT PRINTING PLATE SUPPORTS Filed March 10, 1948 n p 9 INVENTOR:

ATTORNEYS Patented Sept. 9, 1952 METHOD OF EXACT PLACING OF PRINTING PLATES, MADE OF RUBBER.OR SIMILAR MATERIAL, ON PRINTING CYLINDERS OR FLAT PRINTING PLATE SUPPORTS Edward Kreglewski, Poznan, Poland Application March 10, 1948, Serial No. 14,118

In Poland March 18, 1947 2 Claims. 1

Printing plates or blocks made of rubber or similar yielding and elastic material do not find such a universal use they deserve owing to their well known advantages. The main reason for this is the difiiculty of placing the printing plates in an exact position on the plate cylinder or on the flat plate support in such a manner, so that the imprints of the respective separate colours of the printed picture are aligned to fit each other.

It is known, that rubber printing plates or blocks are stuck to paper or cloth mantles by means of e. g. a bilaterally glued strip, whereby a later correcting of the position of these plates by displacing or shifting the once fixed plate is rendered impossible.

This invention permits in a simple and easy Way to fix these plates or blocks instantaneously at the right and exact place namely on cylinder mantles as well as directly on the cylinders or flat platesupports.

This is obtained in the manner that one inserts in the printing matter register rings at exactly the same places at which register rings are punched out in the rubber printing plates. To one of the mounting sheets there are temporarily fastened, in a suitable manner, the proofs, and all mounting sheets are thereupon simultaneously perforated at the plates designated by the registering rings. These perforations serve for the exact, registration and pasting of all printing platesonto the mounting sheets. In order to facilitate this operation register plugs are placed through the corresponding holes in the mounting sheets and the printing plates, whereby the registration takes place mechanically. These registering plugs are removed after the printing plates arepasted on.' f In connection with fiat printing supports and plate cylinders which do not have any devices for the-clamping of the mounting sheets, the mounting sheets are used in the same manner, but om temporarily. They are removed before thefinalpasting on of the printing plates.

The annexed drawing illustrates the performwhereby the presented objects, that serve to carry out this method are shown on this drawing in a larger or reduced scale.

Fig. 1 shows a register type for printing the register rings e.

Fig.2 is a view of a rubber plate 9 schematically shown.

Fig. 3 shows the auxiliary working table for suitable preparation of the mantles.

Fig. 4 presents a perforated mantle p, provided with pins m passing through the holes, having its ont edge held on the plate cylinder, in

spread-out position.

Fig. 5 shows the perforating device.

Fig. 6 represents an indicating pin m on its base K.

Figs. '7 and 8 illustrate the employing of indicating pins by direct fixing of the plates on flat plate supports or plate cylinders.

According to this invention the type j, which reproduces the register ring e, is already located at proper places in the type composition, by obtaining print casts, at best at the top and bottom or on either side of the composition, exactly in the middle line of the said composition. From the aforesaid print cast matrices and rubber plates are obtained in a known manner, which possess, as Fig. 2 shows, the register rings 6.

It is necessary that the register rings of all the print casts cover exactly each other.

After these plates are stuck as usually on the reverse with bilaterally glued strip, and the nec essary number of printed copies are made of it, the ,register rings are then stamped in the plates by means of the perforating device Fig. 5.

In the meantime fastened on the working table a (Fig. 3) are the mantles p already provided with the register rings mentioned before on the printed copies, so distributed and slightly fixed as the ready made printed sheet should look like. Now by means of a perforating device (Fig. 5) in places, where the printed register rings were, holes are stamped out.

When the printed copies are removed, the mantles are turned over on the working table and the pins (Fig. 6) are put through all the holes from the bottom upwards, afterwards the perforated printing plates are put on the pins, by which process the plates are stuck on the mantle ance of the method according to this invention, i exactly at the right places If no register plugs are used, the printing plates can be registered on the mounting sheets in the manner that the holes in the printing plates exactly cover the perforations in the mounting sheets.

3 The following examples explain the practical performing of this method.

Example I perforations their reverse side turned towards the top, and when for example a four colour printing is to be obtained, four mantles will be fixed at once one over the other. After the mantles are fastened on table a the printed copies of the main colour willb'e'fixed on the upper mantle by means of small parts of glued strip namely so as the ready printed sheet should appear and then all the holes will be perforated in the four mantles by means of the perforating device (Fig. 5) After removing of the printed copies the mantles are turned over on the working table, and the pins (Fig. .6) shifted through the holes from bottom upwards and then the perforated printing plates are fixed to the mantles, after shifting of the same on these pins. Then in turn the pins are removed and the ready mantles are stretched cnthe cylinders.

It is alsov possible tofasten the mantles supplied vvithholes immediately on the cylinder by means of the front edge as shown on Fig. 4 and then to shift the pins" through the holes and to roll the mantles on the cylinders. The printing plates are then fixed on it circularly. After the plates are fixed, I proceed to remove the pins and after the same have been removed I stretch the mantle with fixed plates again on the cylinder making it ready for printing. In the same manner I can fix on the mantles previously round shaped printing plates.

For printing on both sides by which method, as it is well known, the plate cylinders of one side revolve in opposite direction of the plate cylinders printing on the other side, all the mantles can also besimultaneously perforated, for instance byprinting on one side ,Withthree colours and with two colours on the other side, three mantles are at first to be placed on the working table with the right side to the top and then thenext two mantles with the back side of the mantle to the top, after which it is to be proceeded according to the above described i. e. that the printed copies are fixed to the upper mantle and all the mantles are to be simultaneously perforated.

Example [I The exact sticking of rubber printing'plates on flat plate supports by fiat-printing machines is carried out according to this invention'in such a manner, that in this case the above mentioned mantles find also temporarily an auxiliary usage. The same are also fastened on the working table and, after a right. distribution of printed copies supplied with register rings, perforated. This method is carriedout as described in Example I. whereby the pins are put through the holes, but such ones are provided previously with perforated pieces of bilaterally glued strip 11., placed onthe base K (Fig. 7). Thus prepared mantles p are placed on the plate support q (Fig. 8). and the overlapping glue strip n around the pins is pressed to the support q.

Now the mantles are removed by cutting them around the pins and the glue strip. The perforated rubber printing plates supplied with bilaterally glued strip are put on the pins, which are stuck to the plate support q. When the printing plates are stuck to the support on its nearly whole area, the ends of the plates are raised and the pins removed.

Example III Using plate cylinders without stretching arrangement the procedure is the same as in Example II.

The above described various kinds of usage are suitable for all occurring Works, they distinguish themselves by simplicity and easy handlingat work. The greatest saving of time lies in thatthe correct distribution of the printing plates is set upon one mantle only, whereby the sticking of the printing plates occurs so to say mechanically with an exactness hitherto unattainable.

Imust however state that my invention is not limited to the above described examples and that this method can be carried out by employing leans made in a different manner as shown on the drawing.

The term rubber printing plates as used herein and in the claims is intended to include plates of naturalorsynthetic rubber orslniilar naturalor synthetic material.

' Having now described my invention I claim what follows:

1. Method for fastening a plurality of pastable printing plates consisting of rubber or similar elastic material onto the printing plate cylinder or its tympan sheets or fiat printing plate supports with exact registen'which method comprises the following steps: stamping circularholes in the printing plates at the placesindicated by register rings inserted in thecomposition; fastening the proofs of the printing plates in corresponding position on a tympan-sheet intended for the pasting on of the printing plates; placing allv tympan sheets, oneabove theother, so that similar circular holes'are simultaneously stamped at the places indicated by the register rings: present in the proofs; passing register plugs provided with supporting plates through these holes of the tympan sheets; placing the printing plates on the register plugs in such a manner that the latter extend beyond the surface of the printing plates; and, finally, pasting the printing platesfirmly on, and then removing the register plugs. I

2. Method for fastening with exact register a pluralityof pastable printing plates of rubber or similar elastic material onto flat printing. plate supports or printing plate-cylinders which do not have any clamping device for tympan sheets,

which method comprises the following steps: stamping circular holes in the printing plates at the places indicated by register rings insertedin the composition; fastening the proofs of the printing plates in corresponding position on one of the tympanxsheets used in this connection; placing all tympan sheets, one on top of the other, and simultaneously punching similar circular holes at the places designated by the register rings presentin the proofs; placing register plugs through these holes of the tympan-sheets,

on the supporting plates of which plugs adhesive tape rings provided with adhesive on both sides have previously been placed; fastening these tympan sheets todthefiat plate supports or plate cylinders with the register plugs pasted-"on the bottom; again removing the tympan sheets by cutting outarouncl the adhesive tape rings so that only the pasted-on register plugs remain; placing th printing plates on the register plugs in such a manner that the latter extend beyond the surface of the printing plates; and, finally, pasting the printing plates on, and removing the register plugs after lifting the edge of the printing plates.

EDWARD KREGLEWSKI.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS Name Date Howe July 6, 1909 Dalziel Mar. 11, 1919 Heck May '1, 1935 Huebner Sept. 27, 1938 Huebner June 27, 1939 Maher Mar. 12, 1940 Ball May 7, 1946 McCarter Oct. 7', 1947 Huebner Dec. 27, 1949 

